/*******************************************************************************
 * This file is part of blueprint4j www.blueprint4j.org.
 * 
 *     blueprint4j is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     blueprint4j is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 * 
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with blueprint4j. If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package blueprint4j.utils;

import java.util.*;

/**
 * A Hashtable class that stores objects that will be nullified in a specified time period
 */

public class HashtableDegenerative extends Hashtable {
	private int timetolive = 0;
	private Hashtable store = new Hashtable();
	
	public HashtableDegenerative(int timetolive) {
		this.timetolive = timetolive;
	}
	
	private boolean expired(Object key) {
		return (System.currentTimeMillis() - ((Integer)store.get(key)).intValue() > timetolive);
	}
	
	public boolean containsKey(Object key) {
		if (super.containsKey(key) && !expired(key)) {
			return true;
		} else {
			return false;
		}
	}
}

